[转]SpringMVC单文件上传、多文件上传、文件列表显示、文件下载

一、新建一个Web工程,导入相关的包

springmvc的包+commons-fileupload.jar+connom-io.jar+commons-logging,jar+jstl.jar+standard.jar

整个相关的包如下:

整个工程目录如下:

二、配置web.xml和SpringMVC文件

(1)web.xml

 

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3. xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  4. xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  5. id="WebApp_ID" version="3.0">
  6. <!-- SpringMVC的前端控制器 -->
  7. <servlet>
  8. <servlet-name>MyDispatcher</servlet-name>
  9. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  10. <!-- 设置自己定义的控制器xml文件 -->
  11. <init-param>
  12. <param-name>contextConfigLocation</param-name>
  13. <param-value>/WEB-INF/springMVC-servlet.xml</param-value>
  14. </init-param>
  15. <load-on-startup>1</load-on-startup>
  16. </servlet>
  17. <!-- Spring MVC配置文件结束 -->
  18.  
  19. <!-- 拦截设置 -->
  20. <servlet-mapping>
  21. <servlet-name>MyDispatcher</servlet-name>
  22. <!-- 由SpringMVC拦截所有请求 -->
  23. <url-pattern>/</url-pattern>
  24. </servlet-mapping>
  25.  
  26. </web-app>

(2)springMVC-servlet.xml文件

 

 

  1. <beans xmlns="http://www.springframework.org/schema/beans"
  2. xmlns:context="http://www.springframework.org/schema/context"
  3. xmlns:util="http://www.springframework.org/schema/util"
  4. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
  5. xmlns:mvc="http://www.springframework.org/schema/mvc"
  6. xsi:schemaLocation="
  7. http://www.springframework.org/schema/util
  8. http://www.springframework.org/schema/util/spring-util-3.0.xsd
  9. http://www.springframework.org/schema/mvc
  10. http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
  11. http://www.springframework.org/schema/beans
  12. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
  13. http://www.springframework.org/schema/mvc
  14. http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
  15. http://www.springframework.org/schema/context
  16. http://www.springframework.org/schema/context/spring-context-3.0.xsd">
  17.  
  18. <!-- 把标记了@Controller注解的类转换为bean -->
  19. <context:component-scan base-package="com.mucfc" />
  20. <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->
  21. <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
  22. p:prefix="/WEB-INF/views/" p:suffix=".jsp"/>
  23.  
  24. <!-- 上传文件的设置 ,maxUploadSize=-1,表示无穷大。uploadTempDir为上传的临时目录 -->
  25. <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
  26. p:defaultEncoding="UTF-8"
  27. p:maxUploadSize="5400000"
  28. p:uploadTempDir="fileUpload/temp"
  29. />
  30.  
  31. </beans>

 

 

 

三、单个文件上传

(1)控制器

 

  1. @Controller
  2. @RequestMapping("/file")
  3. public class FileController {
  4.  
  5. @RequestMapping("/toFile")
  6. public String toFileUpload() {
  7. return "fileUpload";
  8. }
  9.  
  10. @RequestMapping("/toFile2")
  11. public String toFileUpload2() {
  12. return "fileUpload2";
  13. }
  14.  
  15. /**
  16. * 方法一上传文件
  17. */
  18. @RequestMapping("/onefile")
  19. public String oneFileUpload(
  20. @RequestParam("file") CommonsMultipartFile file,
  21. HttpServletRequest request, ModelMap model) {
  22.  
  23. // 获得原始文件名
  24. String fileName = file.getOriginalFilename();
  25. System.out.println("原始文件名:" + fileName);
  26.  
  27. // 新文件名
  28. String newFileName = UUID.randomUUID() + fileName;
  29.  
  30. // 获得项目的路径
  31. ServletContext sc = request.getSession().getServletContext();
  32. // 上传位置
  33. String path = sc.getRealPath("/img") + "/"; // 设定文件保存的目录
  34.  
  35. File f = new File(path);
  36. if (!f.exists())
  37. f.mkdirs();
  38. if (!file.isEmpty()) {
  39. try {
  40. FileOutputStream fos = new FileOutputStream(path + newFileName);
  41. InputStream in = file.getInputStream();
  42. int b = 0;
  43. while ((b = in.read()) != -1) {
  44. fos.write(b);
  45. }
  46. fos.close();
  47. in.close();
  48. } catch (Exception e) {
  49. e.printStackTrace();
  50. }
  51. }
  52.  
  53. System.out.println("上传图片到:" + path + newFileName);
  54. // 保存文件地址,用于JSP页面回显
  55. model.addAttribute("fileUrl", path + newFileName);
  56. return "fileUpload";
  57. }
  58.  
  59. /**
  60. * 方法二上传文件,一次一张
  61. */
  62. @RequestMapping("/onefile2")
  63. public String oneFileUpload2(HttpServletRequest request,
  64. HttpServletResponse response) throws Exception {
  65. CommonsMultipartResolver cmr = new CommonsMultipartResolver(
  66. request.getServletContext());
  67. if (cmr.isMultipart(request)) {
  68. MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request);
  69. Iterator<String> files = mRequest.getFileNames();
  70. while (files.hasNext()) {
  71. MultipartFile mFile = mRequest.getFile(files.next());
  72. if (mFile != null) {
  73. String fileName = UUID.randomUUID()
  74. + mFile.getOriginalFilename();
  75. String path = "d:/upload/" + fileName;
  76.  
  77. File localFile = new File(path);
  78. mFile.transferTo(localFile);
  79. request.setAttribute("fileUrl", path);
  80. }
  81. }
  82. }
  83. return "fileUpload";
  84. }
  85. }

(2)JSP,这个页面是用来上传又用来显示上传后的图片的页面fileUpload.jsp

 

 

 

 

  1. <%@ page language="java" contentType="text/html; charset=UTF-8"
  2. pageEncoding="UTF-8"%>
  3. <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
  4. <%
  5. String path = request.getContextPath();
  6. String basePath = request.getScheme() + "://"
  7. + request.getServerName() + ":" + request.getServerPort()
  8. + path + "/";
  9. %>
  10. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  11. <html>
  12. <head>
  13. <title>用户上传图片页面</title>
  14. <base href="<%=basePath%>">
  15. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  16. </head>
  17. <body>
  18. <center>
  19. <form action="file/onefile"
  20. method="post" enctype="multipart/form-data">
  21. <input type="file" name="file" />
  22. <input type="submit" value="上 传" />
  23. </form>
  24. <h5>上传结果:</h5>
  25. <img alt="暂无图片" src="${fileUrl}" />
  26. </center>
  27. </body>
  28. </html>

 

 

 

现在运行后来看看效果,输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile

控制台输出结果,选择图片后

原始文件名:Chrysanthemum.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/4eafc28c-4baa-4018-ac06-c4a5aec88d6cChrysanthemum.jpg

图片已被上传,可以在JSP中显示出来

来看看服务器的路径:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img

表明图片已经上传到服务器

方法二:

使用文件流的方式来上传

 

  1. /**
  2. * 方法二上传文件,一次一张
  3. */
  4. @RequestMapping("/onefile2")
  5. public String oneFileUpload2(HttpServletRequest request,
  6. HttpServletResponse response) throws Exception {
  7. CommonsMultipartResolver cmr = new CommonsMultipartResolver(
  8. request.getServletContext());
  9. if (cmr.isMultipart(request)) {
  10. MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request);
  11. Iterator<String> files = mRequest.getFileNames();
  12. while (files.hasNext()) {
  13. MultipartFile mFile = mRequest.getFile(files.next());
  14. if (mFile != null) {
  15. String fileName = UUID.randomUUID()
  16. + mFile.getOriginalFilename();
  17. String path = "d:/upload/" + fileName;
  18.  
  19. File localFile = new File(path);
  20. mFile.transferTo(localFile);
  21. request.setAttribute("fileUrl", path);
  22. }
  23. }
  24. }
  25. return "fileUpload";
  26. }

 

  1. <center>
  2. <form action="file/onefile"
  3. method="post" enctype="multipart/form-data">
  4. <input type="file" name="file" />
  5. <input type="submit" value="上 传" />
  6. </form>
  7. <h5>上传结果:</h5>
  8. <img alt="暂无图片" src="${fileUrl}" />
  9. </center>

中的

<form action="file/onefile"

改成

 

 

<form action="file/onefile2"

 

输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile

 

 

方法二指定上传到了本地E盘的upload文件夹

页面结果

四、多文件上传

(1)控制器

 

  1. @RequestMapping("/toFile2")
  2. public String toFileUpload2() {
  3. return "fileUpload2";
  4. }

 

 

  1. /**
  2. * 一次上传多张图片
  3. */
  4. @RequestMapping("/threeFile")
  5. public String threeFileUpload(
  6. @RequestParam("file") CommonsMultipartFile files[],
  7. HttpServletRequest request, ModelMap model) {
  8.  
  9. List<String> list = new ArrayList<String>();
  10. // 获得项目的路径
  11. ServletContext sc = request.getSession().getServletContext();
  12. // 上传位置
  13. String path = sc.getRealPath("/img") + "/"; // 设定文件保存的目录
  14. File f = new File(path);
  15. if (!f.exists())
  16. f.mkdirs();
  17.  
  18. for (int i = 0; i < files.length; i++) {
  19. // 获得原始文件名
  20. String fileName = files[i].getOriginalFilename();
  21. System.out.println("原始文件名:" + fileName);
  22. // 新文件名
  23. String newFileName = UUID.randomUUID() + fileName;
  24. if (!files[i].isEmpty()) {
  25. try {
  26. FileOutputStream fos = new FileOutputStream(path
  27. + newFileName);
  28. InputStream in = files[i].getInputStream();
  29. int b = 0;
  30. while ((b = in.read()) != -1) {
  31. fos.write(b);
  32. }
  33. fos.close();
  34. in.close();
  35. } catch (Exception e) {
  36. e.printStackTrace();
  37. }
  38. }
  39. System.out.println("上传图片到:" + path + newFileName);
  40. list.add(path + newFileName);
  41.  
  42. }
  43. // 保存文件地址,用于JSP页面回显
  44. model.addAttribute("fileList", list);
  45. return "fileUpload2";
  46.  
  47. }

 

其实就是在单文件上传的方法一中来修改的,只不过弄成了个循环

 

 

(2)JSP显示页面fileUpload2.jsp

 

  1. <%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
  2. pageEncoding="UTF-8"%>
  3. <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
  4. <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  5. <%
  6. String path = request.getContextPath();
  7. String basePath = request.getScheme() + "://"
  8. + request.getServerName() + ":" + request.getServerPort()
  9. + path + "/";
  10. %>
  11. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  12. <html>
  13. <head>
  14. <title>用户上传图片页面</title>
  15. <base href="<%=basePath%>">
  16. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  17. </head>
  18. <body>
  19. <center>
  20. <form action="file/threeFile" method="post"
  21. enctype="multipart/form-data">
  22. <input type="file" name="file" /><br /> <input type="file"
  23. name="file" /><br /> <input type="file" name="file" /><br /> <input
  24. type="submit" value="上 传" />
  25. </form>
  26. <h5>上传结果:</h5>
  27.  
  28. <c:forEach items="${fileList}" var="imagename">
  29. <img alt="暂无图片" src="${imagename}" /> <br/>
  30. </c:forEach>
  31.  
  32.  
  33.  
  34. </center>
  35. </body>
  36. </html>

注意这里用了

</c:forEach>

表单,需要jstl.jar+standard.jar

 

(3)运行后输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile2(注意上面是单文件没有后面的数字2)

选择图片,然后点上传
 

控制台输出结果:

图片不清看文字 吧:

原始文件名:Desert.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/2baccc77-43b6-4908-859d-507e86a04051Desert.jpg
原始文件名:Hydrangeas.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/51ad04e0-82aa-4b2c-958d-f00651e9ed6bHydrangeas.jpg
原始文件名:Jellyfish.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/dee340d8-9cc0-41ae-9959-f7fa47ff172bJellyfish.jpg

三张图片都可以显示出来了

来看看服务器,这就是刚刚上传的三张

五、上传文件列表显示

(1)控制器

 

  1. /**
  2. * 列出所有的图片
  3. */
  4. @RequestMapping("/listFile")
  5. public String listFile(HttpServletRequest request,
  6. HttpServletResponse response) {
  7. // 获取上传文件的目录
  8. ServletContext sc = request.getSession().getServletContext();
  9. // 上传位置
  10. String uploadFilePath = sc.getRealPath("/img") + "/"; // 设定文件保存的目录
  11. // 存储要下载的文件名
  12. Map<String, String> fileNameMap = new HashMap<String, String>();
  13. // 递归遍历filepath目录下的所有文件和目录,将文件的文件名存储到map集合中
  14. listfile(new File(uploadFilePath), fileNameMap);// File既可以代表一个文件也可以代表一个目录
  15. // 将Map集合发送到listfile.jsp页面进行显示
  16. request.setAttribute("fileNameMap", fileNameMap);
  17. return "listFile";
  18. }

(2)JSP文件listFile.jsp

 

 

  1. <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
  2. <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
  3. <!DOCTYPE HTML>
  4. <html>
  5. <head>
  6. <title>下载文件显示页面</title>
  7. </head>
  8.  
  9. <body>
  10. <!-- 遍历Map集合 -->
  11. <c:forEach var="me" items="${fileNameMap}">
  12. <c:url value="/file/downFile" var="downurl">
  13. <c:param name="filename" value="${me.key}"></c:param>
  14. </c:url>
  15. ${me.value}<a href="${downurl}">下载</a>
  16. <br/>
  17. </c:forEach>
  18.  
  19. </body>
  20. </html>


(3)运行后输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/listFile       

 

这些为刚刚上传到四张图片。

六、文件下载

(1)控制器

 

  1. @RequestMapping("/downFile")
  2. public void downFile(HttpServletRequest request,
  3. HttpServletResponse response) {
  4. System.out.println("1");
  5. // 得到要下载的文件名
  6. String fileName = request.getParameter("filename");
  7. System.out.println("2");
  8. try {
  9. fileName = new String(fileName.getBytes("iso8859-1"), "UTF-8");
  10. System.out.println("3");
  11. // 获取上传文件的目录
  12. ServletContext sc = request.getSession().getServletContext();
  13. System.out.println("4");
  14. // 上传位置
  15. String fileSaveRootPath = sc.getRealPath("/img");
  16.  
  17. System.out.println(fileSaveRootPath + "\\" + fileName);
  18. // 得到要下载的文件
  19. File file = new File(fileSaveRootPath + "\\" + fileName);
  20.  
  21. // 如果文件不存在
  22. if (!file.exists()) {
  23. request.setAttribute("message", "您要下载的资源已被删除!!");
  24. System.out.println("您要下载的资源已被删除!!");
  25. return;
  26. }
  27. // 处理文件名
  28. String realname = fileName.substring(fileName.indexOf("_") + 1);
  29. // 设置响应头,控制浏览器下载该文件
  30. response.setHeader("content-disposition", "attachment;filename="
  31. + URLEncoder.encode(realname, "UTF-8"));
  32. // 读取要下载的文件,保存到文件输入流
  33. FileInputStream in = new FileInputStream(fileSaveRootPath + "\\" + fileName);
  34. // 创建输出流
  35. OutputStream out = response.getOutputStream();
  36. // 创建缓冲区
  37. byte buffer[] = new byte[1024];
  38. int len = 0;
  39. // 循环将输入流中的内容读取到缓冲区当中
  40. while ((len = in.read(buffer)) > 0) {
  41. // 输出缓冲区的内容到浏览器,实现文件下载
  42. out.write(buffer, 0, len);
  43. }
  44. // 关闭文件输入流
  45. in.close();
  46. // 关闭输出流
  47. out.close();
  48. } catch (Exception e) {
  49.  
  50. }
  51. }


这里就是通过文件流的方式来下载图片的。

 

然后就可以自己选择下载的地方了。

终于讲完了,花了大半天啊!

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  林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka

posted @ 2018-07-21 10:52  dirgo  阅读(721)  评论(0编辑  收藏  举报